object ForGuardDemo extends App {
  // 定义班级英语成绩
  val englishScores: Array[Int] = Array(75,58,90,65,52,88,72,45,68,70,59,82)

  // 初始化变量
  var passCount = 0
  val totalStydents = englishScores.length
  val passScores = collection.mutable.ListBuffer[Int]()

  // 使用for循环守卫筛选及格成绩
  for (score <- englishScores if score >= 60){
    passCount +=1
    passScores += score
    println(s"及格成绩: $score")
  }

  // 计算及格率
  val passRate = (passCount.toDouble / totalStydents) * 100

  // 输出结果
  println(s"\n及格成绩列表: $passScores")
  println(s"\n及格人数: $passCount/$totalStydents")
  println(f"\n及格率: $passRate%.1f%%")

}